Impact of $B\to K\nu \bar{\nu }$ measurements on beyond the Standard Model theories

Abstract

Semileptonic flavor changing neutral current transitions with a pair of neutrinos in the final state are very accurately determined in the standard model (SM) and thus provide an accurate and sensitive probe for physics beyond the SM. Until recently, the poor tagging efficiency for the $B\to K^{(\ast )}\nu \bar{\nu }$ modes made them less advantageous as a probe of new physics (NP) compared to the charged lepton counterparts. The most recent Belle II result on $B\to K\nu \bar{\nu }$ uses an innovative inclusive tagging technique resulting in a higher tagging efficiency; this together with previous BaBar and Belle results indicates a possible enhancement in the branching fraction of $B^{+}\to K^{+}\nu \bar{\nu }$. A reanalysis of the full Belle dataset together with upcoming Belle II dataset is expected to result in a much more precise measurement of this mode. If the branching ratio is indeed found to be enhanced with improved measurements, this would provide an unambiguous signal of NP without uncertainties due to long-distance non-factorizable effects or power corrections (in contrast to $B\to K^{(\ast )}\ell \ell$). We have explored the possibilities of such an enhancement as a signal of NP within several scenarios, which can also explain some of the other tensions observed in neutral as well as charged current $B$-decays. In an effective field theory approach, with the most general dimension-six Hamiltonian including light right-handed neutrinos, we explore the viability of all scalar and vector leptoquarks as well as the parameter space possible with a generic vector gauge boson $Z^{\prime }$ model assuming minimal new particle content. While being consistent with all data, correlations between the observed intriguing discrepancies in $B$-decays are also obtained, which will discriminate between the various NP scenarios.

Matches with published version

References in corpus (19)

• Search for lepton-universality violation in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Measurement of $CP$-averaged observables in the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay
• $SU(2)\times U(1)$ gauge invariance and the shape of new physics in rare $B$ decays
• New strategies for New Physics search in B -> K* nu anti-nu, B -> K nu anti-nu and B -> X(s) nu anti-nu decays
• $\Delta M_s$ theory precision confronts flavour anomalies
• Angular analysis of the $B^{+}\to K^{\ast +}{\mu }^{+}{\mu }^{-}$ decay
• Search for pairs of scalar leptoquarks decaying into quarks and electrons or muons in $\sqrt{s}=13$ TeV pp collisions with the ATLAS detector
• The Anatomy of Z' and Z with Flavour Changing Neutral Currents in the Flavour Precision Era
• Consequences of R-Parity violating interactions for anomalies in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ and $b\to s{\mu }^{+}{\mu }^{-}$
• Probing low energy scalar leptoquarks by the leptonic $W$ and $Z$ couplings
• Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Combined Constraints on First Generation Leptoquarks
• Scalar Leptoquarks in Leptonic Processes
• Vector Leptoquarks Beyond Tree Level III: Vector-like Fermions and Flavor-Changing Transitions
• The role of right-handed neutrinos in $b\to c\tau \bar{\nu }$ anomalies
• Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a $\tau$-lepton in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Global Analysis of Leptophilic Z' Bosons
• Implications of $b\to s\mu \mu$ Anomalies for Future Measurements of $B\to K^{(\ast )}\nu \bar{\nu }$ and $K\to \pi \nu \bar{\nu }$
• Constraining flavour patterns of scalar leptoquarks in the effective field theory

Cited by in corpus (19)

• Interplay of dineutrino modes with semileptonic rare $\mathbf{B}$-decays
• Standard Model Predictions for Rare K and B Decays without New Physics Infection
• The Exclusive Vision of Rare $K$ and $B$ Decays and of the Quark Mixing in the Standard Model
• $B$ meson anomalies and large $B^{+}\to K^{+}\nu \bar{\nu }$ in non-universal $U(1{)}^{\prime }$ models
• When Energy Goes Missing: New Physics in $b\to s\nu \nu$ with Sterile Neutrinos
• $B\to K\nu \bar{\nu }$, MiniBooNE and muon $g-2$ anomalies from a dark sector
• Phenomenology of Scalar Leptoquarks at the LHC in Explaining the Radiative Neutrino Mass, Muon $g-2$ and Lepton Flavour Violating Observables
• Searching for signatures of new physics in $B\to K\nu \overline{\nu }$ to distinguish between Dirac and Majorana neutrinos
• The first limit on invisible decays of $B_s$ mesons comes from LEP
• Consequences of $b\to s{\mu }^{+}{\mu }^{-}$ anomalies on $B\to K^{(\ast )}\nu \bar{\nu }$, $B_s\to (\eta ,{\eta }^{\prime })\nu \bar{\nu }$ and $B_s\to \varphi \nu \bar{\nu }$ decay observables
• Neutrinoless Double Beta Decay from Scalar Leptoquarks: Interplay with Neutrino Mass and Flavor Physics
• $B\to K^{(\ast )}\nu \bar{\nu }$ in covariant confined quark model
• Mutually elusive: vectorlike antileptons and leptoquarks
• Using Machine Learning techniques in phenomenological studies in flavour physics
• Three decades of FCNC studies in 3-3-1 model with right-handed neutrinos: from $Z^{\prime }$-dominance to the alignment limit
• Scoto-seesaw model implied by flavor-dependent Abelian gauge charge
• Recent progress in decays of $b$ and $c$ hadrons
• Model-agnostic likelihood for the reinterpretation of the $B^{+}\to K^{+}\nu \bar{\nu }$ measurement at Belle II
• Constraining Scalar Doublet and Triplet Leptoquarks with Vacuum Stability and Perturbativity